MediaWiki internal error.

Original exception: exception 'DBQueryError' with message 'A database error has occurred
Query: SELECT edit_id,user_name FROM `wiki_pl_current_edits` WHERE page_namespace = '0' AND page_title = 'Психологос:Справка' ORDER BY start_time DESC
Function: pl_ConflictEdit::canUserEdit
Error: 1267 Illegal mix of collations (cp1251_bin,IMPLICIT) and (utf8_general_ci,COERCIBLE) for operation '=' (mysql.lintres.ru)
' in /www/nkozlov/1.11/html/includes/Database.php:824
Stack trace:
#0 /www/nkozlov/1.11/html/includes/Database.php(779): Database->reportQueryError('Illegal mix of ...', 1267, 'SELECT edit_id...', 'pl_ConflictEdit...', false)
#1 /www/nkozlov/1.11/html/includes/Database.php(1224): Database->query('SELECT edit_id...', 'pl_ConflictEdit...')
#2 /www/nkozlov/1.11/html/extensions/ConflictEdit/ConflictEdit.php(189): Database->select('pl_current_edit...', Array, Array, 'pl_ConflictEdit...', Array)
#3 /www/nkozlov/1.11/html/extensions/ConflictEdit/ConflictEdit.php(219): pl_ConflictEdit::canUserEdit(Object(DatabaseMysql), Object(User), Object(Title))
#4 /www/nkozlov/1.11/html/extensions/ConflictEdit/ConflictEdit.php(242): pl_ConflictEdit::processEditButton(Object(DatabaseMysql), Object(User), Object(Title))
#5 [internal function]: pl_ConflictEdit::checkNotification(Object(OutputPage))
#6 /www/nkozlov/1.11/html/includes/Hooks.php(113): call_user_func_array(Array, Array)
#7 /www/nkozlov/1.11/html/includes/SkinTemplate.php(144): wfRunHooks('BeforePageDispl...', Array)
#8 /www/nkozlov/1.11/html/includes/OutputPage.php(707): SkinTemplate->outputPage(Object(OutputPage))
#9 /www/nkozlov/1.11/html/includes/Wiki.php(302): OutputPage->output()
#10 /www/nkozlov/1.11/html/index.php(89): MediaWiki->finalCleanup(Array, Object(LoadBalancer), Object(OutputPage))
#11 {main}

Exception caught inside exception handler: exception 'DBUnexpectedError' with message 'Error in numRows(): Illegal mix of collations (cp1251_bin,IMPLICIT) and (utf8_general_ci,COERCIBLE) for operation '=' (mysql.lintres.ru)' in /www/nkozlov/1.11/html/includes/Database.php:986
Stack trace:
#0 /www/nkozlov/1.11/html/extensions/ConflictEdit/ConflictEdit.php(190): Database->numRows(false)
#1 /www/nkozlov/1.11/html/extensions/ConflictEdit/ConflictEdit.php(219): pl_ConflictEdit::canUserEdit(Object(DatabaseMysql), Object(User), Object(Title))
#2 /www/nkozlov/1.11/html/extensions/ConflictEdit/ConflictEdit.php(242): pl_ConflictEdit::processEditButton(Object(DatabaseMysql), Object(User), Object(Title))
#3 [internal function]: pl_ConflictEdit::checkNotification(Object(OutputPage))
#4 /www/nkozlov/1.11/html/includes/Hooks.php(113): call_user_func_array(Array, Array)
#5 /www/nkozlov/1.11/html/includes/SkinTemplate.php(144): wfRunHooks('BeforePageDispl...', Array)
#6 /www/nkozlov/1.11/html/includes/OutputPage.php(707): SkinTemplate->outputPage(Object(OutputPage))
#7 /www/nkozlov/1.11/html/includes/Exception.php(86): OutputPage->output()
#8 /www/nkozlov/1.11/html/includes/Exception.php(111): MWException->reportHTML()
#9 /www/nkozlov/1.11/html/includes/Exception.php(191): MWException->report()
#10 /www/nkozlov/1.11/html/includes/Exception.php(225): wfReportException(Object(DBQueryError))
#11 [internal function]: wfExceptionHandler(Object(DBQueryError))
#12 {main}